What is a Heat Recovery Steam Generator?
Heat Recovery Steam Generators, or “HRSG” – are, in essence, boilers that captures or recovers the exhaust of a prime mover such as a combustion turbine, natural gas or diesel engine to create steam. Stated another way, a HRSG is used to recover energy from the hot exhaust gases in power generation. It is a bank of tubes that is mounted in the exhaust stack. Exhaust gases as much as 800 F to 1200 F heat these tubes. Water is pumped and circulated through the tubes and can be held under high pressure to temperatures of 370F or higher which can be boiled to produce steam. Furthermore, the HRSG separates the caustic compounds in the flue gases from the occupants and equipment that use the waste heat. HRSG’s are found in may combined cycle power plants. Waste Heat Boilers Waste heat boilers may be horizontal or vertical shell boilers or water tube boilers. They would be designed to suit individual applications ranging through gases from furnaces, incinerators, gas turbines and diesel exhau
